Grease gun



Patented Apr. l5, lQZffl.

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R0?? Q. MACDONALD ND W'LLLIE Lit. "BZRTR, OF TNOPAE, `NEVDA.

GREASE GUN.

Application filed .Func t, 1522231. Serial ic. 481,630.

iliary cylinder arranged at right angles thereto, pistons mounted in said cylinders, an outlet chamber, communicating passages between said chamber and the main cylinder, a check valve arranged therein, and a communicating passage between said auailiary cylinder and said out-let chamber.

In the use of a grease gun it is frequently necessary to force grease into bearings Where lubrication previously used has become solidiied by the evaporation of its lighter constituents and by becoming mixed with dust and other foreign matter. rlhis is particularly true in lubricating the springs of motor vehicles wherein the space provided for lubrication is small and is continuously exposed to dust and mud. When grease has become hardened it is very diiiiu cult andoften impossible to force in grease into the bearings with the ordinary type of grease gun which is Inadeof relatively large capacity.

. In the present' invention we have provided a grease gun having a main chamber of relatively large capacity for filling bearings and housings where low resistance is offered andbeing further provided with a small bore for use when a great-deal of pressure is necessary. The small cylinder isautomatically filled in the ordinary use et the large cylinderandis always ready for service when needed. A check valve is provided near the outlet to prevent the grease forced from the small cylinder u ller high pressure from entering the main cylinder.

in the accompanying drawings we have shown one embodiment of the invention. :in this showing,

Figure 1 is a central vertical sectional view,

Figure 2 is a horizontal sectional view ou the line 2 2 of Figure 19 and Figure 3 is a similar view on line 3-8 of Figure 1.

Referring to the drawings,`the reference numeral 1 designates a main cylinder hav ing a cap 2 which may be detachabiy secured thereto as by means ot threads 3 toperrnit relling. The 'cap is provided with a boss which is internally threaded for the reception of a threaded rod or stem 5. This threaded stem is provided with a handle 6 and a. piston or plunger 7 is mounted on the lower end or the rod. rlhe piston is provided with suitable packing 8 to prevent leakage.

Arranged adjacent the bottom of the main cylinder and substantially at' right angles thereto there is provided an auxiliary cylindcr 9 having a cap or head 10 secured to the cylinder by means of threads 11. The cap is internally threaded for the reception of a threaded rod 12 which is provided with a handle 13 and' carries apiston 14 on its lower end. The piston is provided with suitable packing 15.

in outlet chamber 16 is arranged beneath the` auxiliary cylinder, the outlet chamber being provided with an outlet opening' 17 of the usual forni. The main cylinder communicates witlrthe outlet chamber by means of' passages 18 arranged on` each side ot the auxiliary cylinder (see Figure 2). A check valve 19 is arranged at the bottom of these communicating passages being retained in place by a spring 20. The auxiliary cylin der communicates with the outlet chamber by means of a passage 21 extending through the Wall 22 of the auxiliary chamber.

ln operation. the gun is filled with grease by removing the cap 2 and is ordinarily used in the usual manner by screwing the rod 5 into the main cylinder to lower the piston and force the grease through the passages 18 to the outlet chamber 16 and thence to the outlet opening 17. 1n the op eration ot' the piston in the main cylinder sufiicient grease will pass upwardly through the passage 21 to lill the auxiliary cylinder. W'hen a bearing or housing is to be lubricated in which grease has become solidified and it is diicult to force new grease into it. the auxiliary cylinder 9 is used which enables the operator to force the lubricant into the bearing at a higher pressure. By opn eratingthe handle 13 the piston l is moved inwardly forcing e lubricant through the passage 22 to the outlet chamber 16.

Although we harte shown and. described the preferred embodiment of our invention., it is to be understood that various 'changes in the shape, size, and arrangement of parte may he resorted to without departing from the'spirit of the invention or the scope of the subjoined claims.

, Having thus described our invention, we claim:

l. A grease gun comprising a main cylinder, an auxiliary cylinder arranged at an angle thereto, an outlet chamber below said main cylinder independently operable pistons arranged in said Cylinders and separate communicating passages between Aeach of said Vcylinders and said outlet eh'an'iber.V

2. A grease gun comprising a main cylinder, an auxiliary eylinder arranged at. an angle thereto` independentiy operable pistons arranged in said cylinders, an outlet chamber below said main cylinder, said cylinders being provided with separate passages communicating with said outlet Chamber7 and means. for preventing communication between said outlety chamber and said main cylinder.

3. A grease gun comprising a main ey inder, an integral auxiliary efflinr'ler arranged transversely centrallyy and adjacent one end of said main cylinder; the enter nal diameter of said auxiliary cylinder being smaller than the internal diameter of said main cylinder. independently operable pistons arranged in said cylinders, an outlet chamber arranged below said main Gylinder, and communieatingY there ith around -said auxiliary Cylinder?. a cheek valve `arranged in said outlet chamber to prevent cylinder. an outlet chamber arranged ad-.

jacent the meeting' ends of7 said passages, a 'ffheek valve arranged 1n said chamber to prevent How .of niateriai Jfrom said outlet chamber to said main cylinder. means for between saler permitting onnminiraition auxiliary cylinder and said outlet Chamber1 and means for forcing material from said cylinders to said outletI chamber.

5. A grease gun comprising a pair of cylinders of different. diameters, an outlet chamber eomniunieating through separate passages with each of said c viinders. and independently operable pistons arranged in said cylinders, u

Vin, testimoniv whereof We aiiix our sie naturesin presence of two witnesses. Y

ROY QA. MACDONALD. VLLL M R. BOZAHEH.

\Vitnff,sses: H. H. ATKINSON, 'LOWELL DANnsLs. 

